8. MAINTENANCE
8 - 9
Alarm Status
Segment LED
Display
Alarm Code
ALM8,4,2,1
Abbreviation Alarm Name
Alarm
Clear
Contents
DE1 Encoder
disconnection
(sensor error)
Not
possible
Disconnection of sensor signal (A, B, C
or PS signal) line was detected
DE2 Serial
disconnection
(sensor error)
Not
possible
Disconnection of sensor signal (PS
signal) line was detected
DE3 Encoder initial
error (sensor
error)
Not
possible
Initial data of motor sensor can not be
read in.
1000
DE4 Serial
receiving stop
(sensor error)
Not
possible
No feedback of absolute position data
from absolute sensor
EXDE External
encoder
disconnection
Possible Disconnection of full close sensor
signal line was detected.
Alarm code 0,1 indicates: when Func2/ bit7,6 =”0,0”, “0”= output open and “1”= output short.
Operating state when alarm occurred
POSSIBLE CAUSES
OPERATING STATE
1 2 3 4 5 6
When control power supply is turned on
○ ○ ○ ○ ○ ○
After servo ON
○ ○
During operation
△
○ ○
Corrective Measures
CAUSE CORRECTIVE MEASURES
1 Encoder wiring:
• Incorrect wiring
• Loose connector
• Poor connector contact
• Encoder cable is too long
• Encoder cable is too thin
• Check and correct wiring.
• Check if sensor power voltage of motor is over
4.75V. Correct if necessary.
2 Wrong sensor classification setting of
amplifier
Correct setting.
3 Sensor classification setting differs from actual
sensor.
Replace with servomotor attached with correct
sensor.
4 Faulty amplifier control circuit Replace servo amplifier.
5 Faulty servomotor sensor Replace servomotor.
6 Parameter setting is for full close servo
system.
Set parameters for semi-close system
(Mode2-page0 Func0-bit7).
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